Patents by Inventor Gerhardus C. Van der Graaf

Gerhardus C. Van der Graaf has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Flexible line system for a floating body
    Patent number: 4459066
    Abstract: A multiple tube production riser system includes interconnected first and second sets of parallel tubes, each set of tubes being flexibly supported by a frame. The first frame is vertically suspended from a floating platform and allows a relative displacement between the tubes of the first set in a vertical direction. The second frame is inclined to the horizontal and allows warping of the second set of tubes.
    Type: Grant
    Filed: February 2, 1982
    Date of Patent: July 10, 1984
    Assignee: Shell Oil Company
    Inventor: Gerhardus C. van der Graaf
  • Multiple bore marine riser with flexible reinforcement
    Patent number: 4363567
    Abstract: A multiple bore marine riser adapted to form a communication between equipment on a floating structure and pipelines on the sea bottom includes flexible reinforcement means to prevent the occurrence of high bending stresses in the flowlines of the riser when the latter is subjected to large bending forces.
    Type: Grant
    Filed: August 8, 1980
    Date of Patent: December 14, 1982
    Assignee: Shell Oil Company
    Inventor: Gerhardus C. Van der Graaf